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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd5875deaec9035f7b4b2b29a4c5470845234faf4c3cef5fb206cb8dc764cf0d' 
  AND token = '476uJysYorCFLcnGyUzSWH9B5J+oaSNrfbsXlLkzHtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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