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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff5de12a7ed58943815399bdfa2bb70fd4a0c9d5c632faaa5040a57ad1ebd66f' 
  AND token = 'LrNf6SRCnPMrMJc+rMI9Q11HcfD+PXQ7BLptStuQAaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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