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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ec6e7886e22b2df52c89e8b8c13c925412f86130855371e7c956e63421d8ffa' 
  AND token = 'a9P0p3gqfBvRi6MPeJEpVF/7GY0TZbI9WRUGdIW0TJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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