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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0068f7cbc66aa827a96b0a7199b2d84461ecd4ce53fb10238494481e60fec7a' 
  AND token = 'qMUG7WTo9zOhRMVAa43QUE+SwgeK4/itDSHv98IyEJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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