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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cec13bc0b6c38390c12ee053261ca7edb3f9f626abb89f085e0d7ef70c2434fa' 
  AND token = 'lUC/i1O7ShvY+/Yc1HFh8pFscqHceDqYZXmmeO8TeTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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