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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4872de6fbbf7724046ae6e4b0a84bb6137f619f76187dc07ccbf0fb74e386105' 
  AND token = 'nO8M7FkXygSVQlz4tIaH9aJd8jeMY3wpaSDMdg0FJt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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