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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27bde833b3c8cf7a5938b99ffc98f1dad18e9d2d58d9725e8d534c8880cb90c7' 
  AND token = '5bFra2Y5rWoTb8RxBOKunHuDvpyR+mpNqZefhjJJve4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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