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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb9718d236ba00adac5fc2e16b65316e5e6a0c2a062364369e7c5c87a3265c48' 
  AND token = '+9UQ/5pZdG+mSDgd+zqyB3+LGI3QnB180/8twXrc6hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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