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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31794c66c7d43f212b5453f8ab3f030592e47a2f98091ce93938fc2e8c9b8812' 
  AND token = 'RjEWla7kbo1OXngpRpsG/iEkH3pijWixZxYUblmXwHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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