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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb57a7aa67529a41ffeef09685daa7981849e8b8b2adf2aad39fdfb1277cbe56' 
  AND token = 'F44e3aWH8OHeVBWmPIIa6jxXWfBQ/6tLv3TqygEys8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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