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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80f4d4a75dc52dcf560f6dc5ac50c2a4a17c39811ebaf1266a866ab8832a72a9' 
  AND token = 'NmBUwB0L+e007E5BAleKi3EccMpbH3ZINboRig9ed4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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