SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a57d9a8b26bc2c6dd80d615bbf2955249b787e46232179a83c6ab96518f69305' 
  AND token = 'aY5LNE7FmGsp9DGUhvnS2JwPZSb5x/sB8hnspiZDFvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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