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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88a2e8bfd365d2b3a212c0c228a66b614b047ef2c2c4c9802336ba71c54033fc' 
  AND token = '+9/9jTq1WiCUoTn0RFt2Ip0bLePJi1aUKoZ1v1AS94E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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