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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d63d1a4127a2fe3bfb5cdd7c730b31cc72cd2425edd1c5741f4f0baf1cefc6f' 
  AND token = 'y7YFPXZgtGO4Ny/fN0E1LzBIChfw0f259dD4D/dxPsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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