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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90e2f5d3586548d64c9d2ed84de0bddc4c8c21d2e5d259e764a522ee21d88c52' 
  AND token = 'IlJd99I4s/kvqsQNkrJEh6LZysdFUpLM0+UekA1f6ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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