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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b6e04d64e762917fd5d3986fe185bae04b4400e20092d79114a053292b96ff8' 
  AND token = 'D+lXxmbWi8VcWfNVHViKsHCxBTAxZ/fZ/GED+EuBHNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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