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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62878beb46c31a68a26bdff42b7b04ae178997d4b80b08e17a298251f06023ad' 
  AND token = 'nuXt8PCnSPbCEhkM4h1mHBEf4z2D/3MWMQIEbk97pbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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