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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c56d25e7e2e7778979703d12d36febf9ee20326d932cc940641ebdf280a4ba05' 
  AND token = 'LdQZbuEtD6nH09WyvsjBsQgBFx2YBGyuE7/obIf+kqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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