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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9586635503de473a840c734a905c5db25d3ecf1105658898cdcb85665a7ef8f5' 
  AND token = 'KIHD5dW1fucOsVC/osKkw450aHcu9T6j324uUfirwT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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