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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b2836672900b004ffbd975b182bfb0681bafcab3d79287c7194ca041c2ea8d9' 
  AND token = 'RJLOrI+zdDGWfVxaSKse2Up/c1JXmc91A3eC5+UL80M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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