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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '962e05de4b467d048ea0b7b24edc3c1158c6d9e8b4e2e04c30a36e935fda9c7d' 
  AND token = 'kxdHacXt7YQtY6gDn6t5C1nSKPuU/iHciwD6La4ICto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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