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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd9be8e63070b974268652370d95c9b38ee0935be1f6baa9ed7c072d2b0c6626' 
  AND token = 'fZZfakKFF/szE6M/LqHjw9xj4AGZZ41wTFOjMZshc6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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