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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a1b47302de841cb8e4d5e5cc04e2b9c8024905010290c900700dff1c1e691b7' 
  AND token = 'N+dplLUvcOjto53DyGO1Jdf6s62su5dHrWruFtwsuIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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