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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99ab3dea6ae359d1097058f1e69d92dfddfbbc5e017d1c7e59e5b1bb5e4fd300' 
  AND token = 'swxPBSu9ovgnrFhhMrevs95CD2pM3Vdzlao2yrRubCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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