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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83a296bb4663cf15b31a327875c2e0cde916663505f9eed7dbd211cc69054d4a' 
  AND token = 'euKEIyT/e7Y9ZaEZxH5A5xnBuNgH9RI7I9kTAm8vn8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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