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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5bd3d0263683cbcfbe922a9abda94ba25d2636a95a6108e2f995cf7dbde1fc8' 
  AND token = 'OS01RQKdjKe1WIndjy3DrwadL3Xae+JOGqxObKmYl9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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