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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b6d61c9fa26214366acb2e3d59fdbaceb7c853837934a267ee30375a6692593' 
  AND token = 'uqfteVCVaiwfJ6/sjVDLXT49XUX3l4V13pEYF54e/U8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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