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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27abde4a849b5301c1388234fb7841a309b3344340ec107ce4cdaf204383929d' 
  AND token = 'BBXJ4z2oyynqQ9DDpsJ7X5rt03xVPzL9AtpnXYsH/FU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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