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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd055bb4c4a574ab51e21e8d1705cdb63bba7e327798cd40cb493d5537cf6eb3' 
  AND token = '6Q75Q43ItuPi0RvIHDbVA4jA5l/xVQxH9cL65pHY6E4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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