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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '969638624724c45b7840b5a35ba7c2caf68a949d2b442ae4ad2ff7140bb19087' 
  AND token = 'Dvdh05YhG8ts8TBix7y8xYpl5BNvzzaTG/e9PSBFcIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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