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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eb284c658b839158343294c2993a1dc64216b29520c0ce9693b4dec2a3560c0' 
  AND token = '5Szj5bTVSAKszZ+2SI6ipJhPHVweY7L0fYDUCcGaeGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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