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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85579df9b2f1d0a57bafd95796a335b19950f367ecfb4355646502fbeff9f08f' 
  AND token = 'jHSMMbn2ga6pzVAP2BxVsEh8LB+oHYtIk1D+nt+ASyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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