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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58595c8115fe7af78f74b880677c5722b73147a186ebde3050b9fa0fb5f6a45c' 
  AND token = '9CcJoqQ/p+D0QA4lpXAEvjrYkBdZ9FLNdaNprV/9FN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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