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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec055a64a6e8475c4f606fca85eb129b78fc9a89d276af3bad4ba718b4b7b656' 
  AND token = '6/xAeZSH992cIdDDRp7+80XErsXr6RO+SycVr+2Vg+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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