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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc7aac8e0aeafb8deb90d1ceaae4cb6c156a9c5443cb1f51d5812b6cf4fdc9ea' 
  AND token = 'mYlsZKCV8NsneoQmaPIY7oXO/qAnQuMJkLP6asbC2l8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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