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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a78e11078ff6b5b9ba9c0f82e73cba4155ae1c2782a4b3bae509f94656964de8' 
  AND token = 'YQTzd/otBe4OHfDX/j6hOblk1OZScyorI20AtAtveII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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