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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9c6f9215bc78066e97bdb3b400ffed2ecfc1367d14db1f7e7bccf9328c1465e' 
  AND token = '6kXpbtlq6hgAnze7XMgByhjkPTeq7az7PlHOh9AKuOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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