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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feb7cf2e9211ef7f627daee6534b276d87a5c7379bd563b36062b38c960af571' 
  AND token = 'BDxVWdU1Bn69OyUC9V14bnGQom/knooMEL3At5qcPCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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