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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b70e08a148e800b5256e3a2acb980c4fd66fef981725c5740a5ce8f06efa1767' 
  AND token = 'BBUlA7CKm/HrnrfZTZd5aM3KDvvuaZQyIzwuvsXaw4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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