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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45efb3b151e8e8d28d4ca9ff5dfca07952a42f024f40190287e3b3980be0c085' 
  AND token = 'C06GFytFLPUYeA5kJuqy1dl/S8V0sL84Z33B/WbrVX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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