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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa4ae8f460d36bdcd9fa93463a06eec30818738f398622619b50d28a72d89f05' 
  AND token = 'r73HJG6GR40hQZBjXZehUFRc5l7J6weN1iYb0NyK9Zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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