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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29b60e29c5248cfb4e60529457b28558b2ee26c71ceeff34a8416d20eed3637b' 
  AND token = 'qQBAX8ZnA2aooDtIrgHkYem1JEmbgg0rISMW/n/gY98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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