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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a79d82d66031730e0bbc2b5188c62ed94e95a417fc279e52e763814fdda51da6' 
  AND token = 'pakGS6wb0sf67mtuqkN7gEI8xqPx5A1Yvm4bZVCuK8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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