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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3b6696816b3e8d019b6e469ae492920306ccef51db4367d68a07246c0bb6ff5' 
  AND token = '4tQeWijFEmMAsQl9GKiu2MoTGGl9xWs42m4TSpfS2Oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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