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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da5a7d9f264443d5d1bef72abea88b996d488ac01c96c0c95e0179f2c31afcde' 
  AND token = 'z9lgv4/fBerq9/mOh100EerODRMcZGcHa2QWm/h+PJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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