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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2783986330f5e7b74f1ee2821fdea56f8616b5d8870441bee5184b5842652a75' 
  AND token = 'rFiP7HWgFMQ3Z3D8+vd1V7glghKnFnVaTX2AP8dH+ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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