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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a672b3b45ddd87eda3e5c9a44202c72068d2faed9e8eff1bf770fa74f78555b' 
  AND token = '3MYauRIe3LMvsA2oPh4p/iNROHWekd/FmdsPRWDo+oU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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