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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6579eb6fab92c3b2c70752392a76ae63921e0990be49c3550230022e9684c3e' 
  AND token = 'GU5OXcPkWSXR5d+jVklq6ypluz+58Lqx0MIzSvix2pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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