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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1e5652984ff5acd51e82bdca01223139456e4da2292e9c49411c0908e0ff109' 
  AND token = 'iIjAd5iA5uoetqZ4ueEvfH8WWcWYg7gNQ1mUK2MH090=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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