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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fe09084ffa959562c6ca780ae27a23dfce8c1c8e25b0fb29f598c83d2c9b95d' 
  AND token = '3oOefPeKKJH9PYd7MxWCAr+FIZtzhyf8XVikdix5KnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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