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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f27360f5beac3bbab8ee80bf963b1c68955674458adee1352ca40566532b37b' 
  AND token = 'XWkePw0Ert2EQTEDEXtQUXeAO+d5YlmHRUXFav5wmxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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