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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '359a5e89d6de387b47a5ef00dcbdb8532f5cd3363ab6bddd6c25c58942e7afc7' 
  AND token = '53EfRXs9lPnmmnytnm7ki5ThmewuAhZsnISnqoPiLJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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