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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7c314272964867bb7c7c8f9cf65ee7ccadc219cf769d7d6ad54a505c4fd3418' 
  AND token = 'YNEEcRtrmucTXn2gz8I5QE7qPziX4RY/nsRlrOYDS/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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