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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35d90a7d6e048f387a8576c896fa5a36ec5ae4941cad7919ee15ac232fb797cb' 
  AND token = 'TLGMY3ZmL3kZqCSU5ecfLGy4Rrik+c+p6TrE4AGDvIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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