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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaf5a429a39e44bb77c076a95001367badd05282a988dadc3e1df0e3b7e03ff6' 
  AND token = 'SmINQCNmhVANTRxbYCeUj1db1j/fql5t0OYbpDXqXGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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