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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b77eef434dad38f270e011f120558d4cf44e37d4084253f3cbdd23917279fed' 
  AND token = 'bHpni4WHAcu2TNzufq1LIRe7RtnOeOZV0RJur+IUepY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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