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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd630b829ec95fefa23efb9a05a6862da8cdc738b654f304a72238429faab1e3' 
  AND token = 'Xx3DlMwx0LBEZ61Ib1IgfxO2rq72NuRqWWF54cHfzdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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