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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44d52486e59b631ed45a3bf90c5943dbe79292f6652f20a928f3cfd5a6a25531' 
  AND token = 'AuB9Txlvs3i76netZ41GdnY4Z8VuqYFghn53rl7JhRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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