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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ebee3d1349085b77e52f205b12488cc7e56ef59e6f32cb4ff3260509cb2fd96' 
  AND token = 'PHeSm7tNdiDtI76q+aFgTXRcAh/14gfn0G87O5AW4K0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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