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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3567dae545e785eb65d2d7ce3ca18e1f51fb6b7ba3dbe1cdf7c4ca726946546f' 
  AND token = 'DiBUB7yUGruwRjZ8Q/WLnJ/4Iu9dWvC/77EEpS24Jjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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