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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c684f418750926b83879bfa51086dde75d6b95a20cec8380658aedf80e60b04' 
  AND token = 'rshZ9p3UVGgQP87OrBPiS/2CoYII/v4Dsiqr0aihdEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}