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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a688e9941a4e2640b4e9747ed557c40ca8dea14173a5437dc8ab3148e3a823bb' 
  AND token = 'wwG5CUxH/u8iteisLrrWirtxcC+NQ0s6JgUEQF56m+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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