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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ce205a878fda5874e1a5e772c1edc472a07dcd867608bcb7b36312db686a032' 
  AND token = 'rFJNaNtGbJbecR27o3LRIY/HVDufitzN3Gzf/us4I6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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