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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f49c2af1f55f606df105ca1ea25cbd5517428e0958ff1ad9de28b4dfee037ab' 
  AND token = 'Ah2ymCb/jCDAL2pTu6hasKflF7rDEd0NF3OwolGsoIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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