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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd623188dac9424d7ad796fb9e85ecb85bed4439350917df9f45500b6cf2847d2' 
  AND token = '/aOmLGlbnGPdb2dx8u/LS1PO2v9ve/HUDfWKFnRrt5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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