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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e14c9c590c24eebc2fbd331bbb705567bf71802e0ad00b0d03dd52ae3ed52e00' 
  AND token = 'pbQBDJaOK6w2nAzcrOcNARFP1J4cZPutjRkPih6L6Ao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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