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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c82b2efb6b8e7936d824ddb6699deb4f9dc971191e016d93ce3d39865365162' 
  AND token = 'oQ4QzCirbYOaUBThS8izX8HUJbf/VzCrH1I01MV0MRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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